2 ms·I'd love to hear practical examples of how I can accomplish this long-wavelength exposure myself.by jamesgill 4y agoI'd love to hear practical examples of how I can accomplish this long-wavelength exposure myself.calebm 4y agoGo look at the sunbXVsbGVy 4y ago"Deep red" leds. They are used to grow cannabis indoor, very easy to find.